The start method can now also accept a string. Text to be parsed will per default be via the console, but now it can be optionally started with a String.
added getter for the treecontroller of the app
Added support for absolute multiplicities(example: 4..4)
Added tests for running the app with a string as input.
Added tests for custom multiplicities. These are sentences with keywords as "maximaal" and "minimaal" and absolute mulitplicities(4..4)